I will add that when the ported 572xp was out of commission I used a Ms460 and a 365 special. Both were ported. I thought both would be quite comparable but that wasn’t the case. The 572 in plain words had more power. It took me by surprise... as the 572 is very friendly to run and you underestimate it. Smooth saw. You get used to it. I was getting pinched a lot more with the other two saws since I was used to the 572’s very very flat forgiving torque curve. The other two weren’t no kittens either, they were strong. Which is why it surprised me. I was wanting my 572 back by the third day lol. I also realized how spoiled I was with the autotune as well not having to carry the little orange screwdriver around and waste time tuning. The fuel mileage is also great with the 572, especially compared to the 460.